It's not the same as property tax, because she's not a government and the power bases are quite different. Governments can get away with it because the switching cost of moving to another country or state is just too high, and they have all the power in the relationship so can charge what they like. That's the abuse, if you're looking for it. Switching costs of bingo card writers is very low. Nonetheless, he's voluntarily paid more than he could have.

There's very little IP value in bingo cards. It's a collection of words for SEO value. You could swap them out with another collection and you'd have a similar result.